\documentclass[../libro.tex]{subfiles}

\begin{document}

\ifSubfilesClassLoaded{\frontmatter}{}

\pagenumbering{Alph}
% \thispagestyle{empty}

% The length cannot be defined for the second time.
% It is used in the last page again.
\ifdeflength{\centeroffset}{}{\newlength{\centeroffset}}
\setlength{\centeroffset}{-0.5\oddsidemargin}
\addtolength{\centeroffset}{0.5\evensidemargin}

% The title page is inspired by "The Not So Short
% Introduction to LaTeX2e"
\begingroup
\sffamily
%\addtolength{\textwidth}{-\centeroffset}
\thispagestyle{empty}
\vspace*{\stretch{1}}
\noindent\hspace*{\centeroffset}\makebox[0pt][l]%
{%
    \begin{minipage}{\textwidth}
        \flushright
        {\Huge\bfseries\latitolo{}}
        \noindent\rule[-1ex]{\textwidth}{5pt}\\[2.5ex]
        \hfill\itshape{\Large%Type the subtitle here
            % 或 \pageref{libro:LaLastaPagxo}~分了解行列式}
            或 367~分了解行列式}
        % 或 \ifSubfilesClassLoaded{367}{%
        %     \pageref{libro:LaLastaPagxo}}~分了解行列式}
    \end{minipage}%
}\par
\vspace{\stretch{1}}
\noindent\hspace*{\centeroffset}\makebox[0pt][l]%
{%
    \begin{minipage}{\textwidth}
        \flushright
        % \textbf{\laauxtoro{}}
        \textbf{\laauxtoro{}}
        \\[1ex]
        % Type the version here
        版本~2π,
        \lajaro{}
    \end{minipage}%
}\par
%\addtolength{\textwidth}{\centeroffset}
\vspace{\stretch{2}}%
\clearpage
\endgroup

\thispagestyle{empty}\mbox{}\clearpage

\end{document}

This cover was inspired by
the one in Tobias Oetiker's
"The not so short introduction to LaTeX".
